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If you fit a new cable you've got to test it. Takes a second to figure out if the mech will roll the chain over the the largest sprocket or take the cage in to the spokes.
Possible that the mech was never limited properly and just relied on the lack of cable tension to prevent it from killing itself. Then a new cable goes in, a bit tighter and crunch it's all gone wrong.
Howard
Well yes, but possibly the derailleur just SRAMED when it went suddenly into the spokes. What could the mechanic have done to cause this?